fix(auth): initialize googleClient for Google OAuth verification

[Aditya30ag]

Description

Fixes #114

This PR fixes a runtime error occurring during Google OAuth authentication where googleClient was referenced before being initialized in server.js.

The issue caused the /api/auth/google endpoint to fail with:

ReferenceError: googleClient is not defined

The fix initializes googleClient using OAuth2Client and the configured GOOGLE_CLIENT_ID environment variable.

Changes Made

• Added initialization for googleClient in server.js
• Configured OAuth2Client using process.env.GOOGLE_CLIENT_ID
• Fixed Google OAuth token verification flow
• Validated server syntax using node -c server.js

Screenshots (if applicable)

N/A

Checklist

• I have linked the relevant issue above.
• I have tested my changes locally.
• My code follows the project's style guidelines.

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